George Fisher Mine (previously Hilton mine) is an underground zinc-lead-silver mine. It has two separate mining areas. The older Hilton mine is now known as George Fisher South and the newer mining area is George Fisher North (previously Hilton North).

The George Fisher orebody is an economic sulphide mineralisation. It is distinct from the nearby Mount Isa deposit due to its lack of breccia-hosted copper mineralisation. The deposit is composed of a series of 11 stratiform orebodies striking near N-S and dipping west between 30°-90°.

Lead-zinc-silver mineralisation occurs in galena and sphalerite-rich bedding parallel horizons in dolomitic and variably carbonaceous pyritic shales and siltstones. Orebody and structural interpretation, modelling and classification of the mineral resource was completed on the basis of additional geological information and improved systems.

The current extraction method at George Fisher is sublevel open stoping.

The mine is located on Mining Lease ML8058 and the lease expires on 30 November 2036.

Zinc in Mount Isa
Ore mined is roughly crushed on site, then trucked to the Mount Isa mills for processing. First, the ore is ground into a fine dust via a series of ball mills. This dust is then mixed with water and reagents in zinc-lead concentrator's flotation circuit. The reagents help to separate the valuable mineral content from waste rock. Air is forced through the slurry creating bubbles, which float to the surface and attract and bind to the zinc or lead particles. The glossy, mineral-laden "froth" is then skimmed off the top and dried. What remains once the water content of the froth has evaporated is zinc or lead concentrate. Zinc concentrates are sold in the domestic market and exported overseas, while lead concentrate undergoes further processing and smelting on site to become crude lead, or lead bullion.

Lead concentrate is mixed with high grade silica, limestone and copper slag, a by-product of our copper smelting operations. These ingredients are known ........